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- October 27, 2025
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MAN Diesel Engine 9L28-32
A company based in Dubai contacted RA Power Solutions about a crankshaft problem in their MAN diesel generating set, model 9L28/32.
The make, model of Engine, and crankshaft details are given below:
| S. NO | Crankshaft Details | |
| 1. | Engine Make | MAN B&W |
| 2. | Engine Model | 9L28/32 |
| 3. | Crank pin Diameter Standard | 230 mm |
| 4. | Crankpin Bearing Width | 98 mm |
| 5. | Place of execution of crankshaft repair | Sailing from Port of Jebel Ali Dubai to JNPT port India(Mumbai) |
Repair of MAN Engine Model no. 9L28/32 Diesel Generating set Crankshaft
RA Power Solutions deputed two technicians along with an on-site crankshaft grinding machine, and technicians boarded the vessel at port of Jebel Ali Dubai. On conducting the inspection following are the main observations of the crankshaft of MAN Engine Model no. 9L28/32 diesel generating sets.
- We inspected AE#02 and found damage on crankpin no. 3. Bearing material had embedded itself on the crankpin surface. After we removed the white metal from the crankpin, we measured the dimensions and observed the following:
- Minimum crankpin diameter observed: 229.44 mm
- Maximum crankpin diameter observed: 229.83 mm
- The above readings were observed against the standard diameter of 230.00 mm.
- The radius fillet and lubricating oil hole profiles were found acceptable with no damage.
- Deep Bearings line marks were observed on the remaining 8 numbers of crankpins.
- All the crankpins were subject to hardness test and crack check by MPI method and no abnormality was observed.
- All other parameters were observed within limits.
Successful Crankshaft Repair of MAN Engine Model no. 9L28/32
- We initially ground crankpin no. 3 to an undersize of 1.0 mm, bringing the diameter to 229.00 mm. When we still noticed bearing line marks, we decided to grind it further. The final size maintained after grinding and polishing was 228.50 mm, which is 1.5 mm undersize.
- We used our state-of-the-art crankshaft grinding and polishing machine with the latest polishing media to polish all the remaining crankpins and remove the rough surface finish and bearing line marks.
- The surface finish of less than 0.20 RA value was maintained.
- The ship had the 1.5 mm undersize bearing available which was assembled and the engine was put on load.
RA Power Solutions has more than 45 years of experience in extending on-site crankshaft grinding service, metal stitching, rebabbitting of bearings, and all the services related to engine repair. We undertake onsite grinding of crankshafts up to 700 mm in diameter.
Our crankshaft grinding machine allows us to grind and polish the crankshaft even while the vessel is sailing. There is no requirement to hold the vessel at the port or at an Anchorage.
For more details regarding on-site crankshaft grinding service, rebabbitting of bearing, and engine block repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.
FAQs:
On-site repair reduces downtime, avoids transportation of the engine or major components and allows working directly at the installation site.
We service major brands such as Wärtsilä, MAN, Caterpillar, Daihatsu, Yanmar and others for both marine and industrial applications.
We follow a rigorous procedure: dismantling → chemical cleaning → inspection → reconditioning → assembly, following OEM guidelines.